I need some clarity on the roles & responsibilities of Change Initiator vs Change Implementer. We have a change we would like to apply on our environment, but it seems our understanding of the ITIL Change Management process differ. So I need an ITIL Change Management expert help
Change initiator is someone who starts i.e. initiates Change Management process. That could be your customer, Service Level Manager, you Continual Service Improvement manager (or some similar role), Problem Management process...etc. That depends how did you set your Change management process.
Change Implementer is the one who implements change. Usually, Release and Deployment Management process is responsible to implement changes. Of course, standard changes (i.e. pre-approved changes) are not meant by that. They will be implemented by your administrators, IT Operations team or someone similar (again, depending on the organizational setup).